I think it's more just that because everyone assumes they have pointy ears, it's good to point out that the text doesn't say so. It's good to point out common assumptions, as it helps us realize the unconscious biases we bring to a text.
Tolkien's works are not just interesting for the plot. They are about world building, linguistics, mythology building.
Well there is a whole journal dedicated to the study of the works of Tolkien [0]. So getting things correct can be very important :)